>    Site-local addresses are designed to be used for addressing inside of
>    a site which is not permanently connected to the Internet. Using
>    site-local addresses, a subnet ID may be up to 54-bits long, but it
>    is recommended to use at most 16-bit subnet IDs, for convenience of
>    subnet management.

I really don't think this is sufficient.  First because SLs don't work
for a network that has any connection to another network (it doesn't
have to be the public Internet), and second because it says nothing
at all about the problems with SLs.

I suggest

Site-local addresses are designed to be used for addressing inside of
networks which have no connections to external networks.  Other networks
need to provide global addresses to their nodes.  Use of site-local
addresses on networks with external connectivity (especially in the 
absence of global addresses) is known to cause problems for some 
applications, and such use is currently not recommended.  This recommendation
may be changed once the implications of application use of site-locals 
are better understood.  When using site-local addresses, a subnet ID may 
be up to 54-bits long, but it is recommended to use at most 16-bit subnet 
IDs, for convenience of subnet management.
 
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